CN108683203A - Energy-storage system - Google Patents
Energy-storage system Download PDFInfo
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- CN108683203A CN108683203A CN201810335469.9A CN201810335469A CN108683203A CN 108683203 A CN108683203 A CN 108683203A CN 201810335469 A CN201810335469 A CN 201810335469A CN 108683203 A CN108683203 A CN 108683203A
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- battery
- voltage
- bms
- management system
- energy
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- 238000004146 energy storage Methods 0.000 title claims abstract description 143
- 239000000178 monomer Substances 0.000 claims description 87
- 230000005611 electricity Effects 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241000163925 Bembidion minimum Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- H02J7/0026—
-
- H02J7/008—
-
- H02J7/0088—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to technical field of energy storage, and in particular to a kind of energy-storage system comprising it includes battery system, the cell system control unit being connect with battery system and energy storage inverter PCS；Battery system includes at least one set of battery modules, battery modules include multiple concatenated single batteries and with the one-to-one battery management system BMS of battery modules；Cell system control unit is connected with energy storage inverter PCS；Cell system control unit acquires the state parameter of battery system, judges the fault type of battery system according to state parameter and report fault type to give energy storage inverter PCS, charge/discharges of the energy storage inverter PCS according to fault type control battery system；The present invention can be with reporting fault type, be conducive to user to find failure in time and take the necessary measures, its energy storage inverter PCS can be controlled for all types of charge/discharges to battery system of different faults, the safety for further improving battery system is conducive to extend the service life of battery system.
Description
Technical field
The present invention relates to technical field of energy storage, and in particular to a kind of energy-storage system.
Background technology
With the worsening of the continuous aggravation and environment of global energy crisis, the change of energy field is extremely urgent, wind
The generations of electricity by new energy mode such as light is come into being and is gradually developed.
Current family's energy-storage system application diversification, mostly uses MOS and is controlled as switch, easily sent out in high current
Raw burn ruins defencive function failure, does not alert and adopts an effective measure, to which the danger such as burning, explosion occur；In addition at present
Product and PCS there is no effective communication, the measure safer to battery system is not taken when Multi-stage alarming occurs, is caused pair
The service life of battery itself, security performance injury eventually lead to dangerous generation.And existing energy-storage system is in its operating status and generation
Instruction after failure is not clear enough, is unfavorable for the maintenance of user used.
Invention content
It is an object of the invention to overcome the deficiencies of existing technologies, provide a kind of energy-storage system can with reporting fault type,
Be conducive to user to find failure in time and take the necessary measures, and its energy storage inverter PCS can be directed to different faults type pair
The charge/discharge of battery system is controlled, and is further improved the safety of battery system, is conducive to extend battery system
Service life.
To achieve the above object, present invention employs following technical solutions：
A kind of energy-storage system comprising battery system, the cell system control unit being connect with battery system and energy storage
Inverter PCS；The battery system includes at least one set of battery modules, battery modules include multiple concatenated single batteries and with
The one-to-one battery management system BMS of battery modules；Cell system control unit is connected with energy storage inverter PCS；
The state parameter of the cell system control unit acquisition battery system, according to state parameter judgement battery system
Fault type simultaneously reported and gives energy storage inverter PCS by fault type, and energy storage inverter PCS is according to fault type control battery system
The charge/discharge of system.
Preferably, the battery system includes multiple battery modules and multiple correspondingly with multiple battery modules respectively
Battery management system BMS, multiple battery management system BMS, which are connected with each other and can carry out slave identification automatically, constitutes battery system
It unites control unit, a state for summarizing battery system as host in the battery management system BMS of multiple battery modules is joined
Number is simultaneously communicated with energy storage inverter PCS, remaining provides state parameter information as slave and to host.
Preferably, the battery system includes a battery modules and a battery management system corresponding with the battery modules
Unite BMS, and described battery management system BMS constitutes cell system control unit, and battery management system BMS is as host
Summarize the state parameter of battery system and is communicated with energy storage inverter PCS.
Preferably, the battery management system BMS acquires the battery modules temperature of each battery modules by temperature sensor,
Battery modules temperature of the battery management system BMS according to the multiple battery modules acquired as host, judges that energy-storage system is
The no failure big there are the battery system temperature difference.
Preferably, the battery management system BMS is connected with each single battery of battery modules connected to it respectively, is adopted
Collect each monomer battery voltage and calculate battery modules voltage and module monomer voltage value according to monomer battery voltage, passes through monomer electricity
Cell voltage is compared to determine with module monomer voltage value with the presence or absence of the unbalanced failure of monomer battery voltage.
Preferably, the battery management system BMS is connected with each single battery of battery modules connected to it respectively, is adopted
Collect each monomer battery voltage, and battery modules voltage is calculated according to monomer battery voltage, battery management system BMS is by the list of acquisition
Body cell voltage and monomer battery voltage threshold value comparison, judge single battery with the presence or absence of monomer battery voltage low, single battery
The high failure of voltage；The battery modules voltage that battery management system BMS as host summarizes all battery modules obtains battery
System voltage, the battery management system BMS as host is by the cell system voltage being calculated and cell system voltage threshold value
Compare, judges battery system with the presence or absence of the failure that cell system voltage is low, cell system voltage is high；
And/or the battery management system BMS acquired by current divider FL1 battery modules battery modules charging current,
Battery modules discharge current, the battery management system BMS as host is according to the battery modules charging current of each battery modules, electricity
Pond module discharge current calculates battery system charging, battery system discharge current, by battery system battery system charging current with
Battery system charging current threshold value comparison judges electricity by battery system discharge current compared with battery system discharging current threshold
The failure that cell system is big with the presence or absence of battery system charging current, battery system discharge current is big；
And/or the battery management system BMS acquires battery modules temperature by temperature sensor, judges whether
The failure that battery modules temperature is high, battery modules temperature is low, the battery management system BMS as host summarize all battery modules
Battery modules temperature obtain battery system temperature, judge battery system with the presence or absence of battery system temperature high, battery system temperature
Spend low failure.
Preferably, the battery management system BMS acquires battery modules by its R+ insulating monitorings end, R- insulating monitorings end
Insulating signal obtain insulation values, and according to the insulation values of acquisition, judge battery modules with the presence or absence of the low failure of insulation values；
And/or the battery management system BMS detections battery modules whether there is the failure of relay adhesion.
Preferably, multiple alarm levels are arranged for same fault type in the cell system control unit, for same
Multiple and different grade thresholds is arranged in state parameter, and classifying alarm is carried out for different grade thresholds.
Preferably, the cell system control unit calculate in real time battery system the maximum chargeable electric current of battery system,
Battery system maximum can discharge current, and be reported to energy storage inverter PCS, the reality of energy storage inverter PCS control battery systems
The battery system maximum that charging current, actual discharge electric current are no more than the battery system that cell system control unit reports is chargeable
Electric current, battery system maximum can discharge currents.
Preferably, the highest monomer battery voltage ＜ a of the battery management system BMS acquisitions, then battery system control
The chargeable electric current of maximum that unit is reported to energy storage inverter PCS is N*72A, and N is the group number of battery modules；
The highest monomer battery voltage of the battery management system BMS acquisitions, meets a≤highest monomer battery voltage
≤ b, then the chargeable electric current of maximum that cell system control unit is reported to energy storage inverter PCS is N*38A, and N is battery modules
Group number, a and b are preset rotection thresholds, a ＜ b；
The highest monomer battery voltage ＞ b of battery management system BMS acquisition, then cell system control unit report
Energy storage inverter PCS stops charging, if highest monomer battery voltage fall after rise to b hereinafter, cell system control unit still on
Energy storage inverter PCS is reported to stop charging, until cell system control unit detects battery system electric discharge and discharge capacity ＞ 5%
Battery system capacity when, cell system control unit again according to acquisition highest monomer battery voltage determine that maximum can fill
Electric current is simultaneously reported to energy storage inverter PCS.
Preferably, the minimum monomer battery voltage ＞ c of the battery management system BMS acquisitions, then battery system control
Unit be reported to energy storage inverter PCS maximum can discharge current be N*72A, N be battery modules group number；
The minimum monomer battery voltage of battery management system BMS acquisition meets the monomer battery voltage of d≤minimum
≤ c, then cell system control unit be reported to energy storage inverter PCS maximum can discharge current be N*38A, N is battery modules
Group number, a and b are preset rotection thresholds, d ＜ c；
The minimum monomer battery voltage ＜ d of battery management system BMS acquisition, then cell system control unit report
Energy storage inverter PCS stops electric discharge, if minimum monomer battery voltage gos up to d or more, cell system control unit still on
Energy storage inverter PCS is reported to stop electric discharge, until cell system control unit detects battery system charging and charging capacity ＞ 5%
Battery system capacity when, cell system control unit determines that maximum can discharge electricity according to the minimum monomer battery voltage of acquisition
It flows and is reported to energy storage inverter PCS.
Preferably, when powering on, after power on delay, multiple battery management system BMS carry out slave identification, each battery automatically
Management system BMS detects the state of corresponding battery modules and is sent to the battery management system BMS as host respectively, as master
If the voltage difference between the battery management system BMS judgement battery modules of machine, which is less than, powers on threshold pressure differential, and fault-free class
The alarm of type, then the contactor KM1 that battery modules are controlled by each battery management system BMS are closed,
If pressure difference between battery modules is more than voltage difference threshold value, the minimum battery modules of first sealing voltage and with minimum electricity
It presses pressure difference to be less than the contactor KM1 of the battery modules of voltage difference threshold value, opens charging, until the pressure difference between battery modules is less than electricity
What voltage was high after threshold pressure differential recloses the contactor KM1 of remaining battery modules.
Preferably, the minimum monomer battery voltage ＜ e of the cell system control unit acquisition, and energy storage inverter
PCS does not charge to battery system in time T, then battery management system BMS automatically into dormant state and disconnects contactor
KM1；
Alternatively, the minimum monomer battery voltage ＜ e of the cell system control unit acquisition, energy storage inverter is in the time
It charges to battery system in T, then battery management system BMS is kept in contact device KM1 and is closed.Such as e is 3.4V, time T is 24 small
When.
Preferably, the battery modules include cathode output end DC+ and cathode output end DC-, cathode output end DC+ and negative
Pole output end DC- is used for multiple battery modules in parallel, and the positive BAT+ of the battery modules passes through the fuse that is sequentially connected in series
FR1, contactor KM1 are connected with cathode output end DC+, and the cathode BAT- of battery modules passes through current divider FL1 and cathode output end
DC- is connected；The positive BAT+ of the battery modules passes through the ship type switch K2 and fuse FR2 being sequentially connected in series and the first DC/DC
The input terminal of converter is connected, and the cathode BAT- of battery modules is connected with the input terminal of the first DC/DC converters, the first DC/DC
The output end of converter is connected to it with battery management system BMS and provides working power, battery management system BMS and wake-up switch
K4 is connected, and battery management system BMS is connect with each single battery respectively, is connect with the temperature sensor being arranged in battery modules.
Preferably, the battery management system BMS is connected by control interface with temperature control device, and temperature control device includes heat dissipation
Fan and heating mechanism, when the temperature of battery modules is more than its high temperature threshold value, radiator fan starts, and is conducive to battery modules
Rapid cooling, when the temperature of battery modules is less than its low temperature threshold, heating mechanism starts.
Preferably, battery management system BMS is connected with indicator lamp groups, provides working power for indicator lamp groups and controls instruction
The working condition of lamp group.
Preferably, the indicator lamp groups include the indicator light battery plate and and indicator light being connected with battery management system BMS
The connected multiple indicator lights of battery plate.
The energy-storage system of the present invention, includes the cell system control unit being connect with battery system, and battery system control is single
The state parameter of member acquisition battery system, and judge fault type according to state parameter, be conducive to the storage for finding the present invention in time
Can system the problem of, and user can take the necessary measures according to fault type, and the present invention is avoided to nonserviceable lower long-term fortune
Row is damaged；The energy-storage system of the present invention further includes energy storage inverter PCS, cell system control unit and energy storage inverter
PCS links, and energy storage inverter PCS can control the charge/discharge of battery system according to fault type, and energy storage inverter PCS is directed to
Different fault types takes different charge/discharge schemes, more intelligence to be effectively protected battery system, avoid dangerous hair
It is raw.
In addition, the battery system of the present invention may include a battery modules, the battery modules of multiple parallel connections can also be included,
The quantity of battery modules can be adjusted flexibly to use the power demand of user in user.Preferably, when the battery mould of battery system
Group can identify with slave, the battery management system BMS as host summarize the state parameter of battery system and with energy storage inversion
Device PCS is communicated, and additional control chip is not necessarily to, easy to use and at low cost.
In addition, the battery modules are by contactor KM1 input/output, the high current tolerance of contactor KM1 is good,
The possibility that the present invention is burnt in the case of high current can effectively be reduced.
Description of the drawings
Fig. 1 is the structural schematic diagram of energy-storage system of the present invention；
Fig. 2 is another structural schematic diagram of energy-storage system of the present invention；
Fig. 3 is battery modules of the present invention and the connection diagram of cell system control unit；
Fig. 4 is the circuit diagram of invention indicator lamp groups.
Specific implementation mode
Below in conjunction with the embodiment that attached drawing 1 to 3 provides, the specific embodiment party of the energy-storage system further illustrated the present invention
Formula.The energy-storage system of the present invention is not limited to the following description.
The energy-storage system of the present invention comprising battery system, the cell system control unit being connect with battery system, and
Energy storage inverter PCS；The battery system includes at least one set of battery modules, and battery modules include multiple concatenated single batteries
With with the one-to-one battery management system BMS of battery modules；Cell system control unit is connected with energy storage inverter PCS；Institute
The state parameter for stating cell system control unit acquisition battery system, the fault type according to state parameter judgement battery system is simultaneously
Fault type is reported and gives energy storage inverter PCS, energy storage inverter PCS according to fault type control battery system charging/put
Electricity.
The energy-storage system of the present invention, including battery system, cell system control unit and energy storage inverter PCS, battery system
The state parameter of control unit of uniting acquisition energy-storage system, and judge fault type according to state parameter, be conducive to find storage in time
Can system the problem of, avoid energy-storage system lower longtime running of nonserviceabling from being damaged；The cell system control unit will
Fault type is reported to energy storage inverter PCS, and energy storage inverter PCS can control the charging of battery system/put according to fault type
Electricity, energy storage inverter PCS take different charge/discharge schemes, more intelligence to be effectively protected for different fault types
Battery system avoids dangerous generation.
The energy-storage system of the present invention is a kind of family's energy-storage system, below with reference to Figure of description and embodiment to this hair
Bright family's energy-storage system is described further.
As shown in Figure 1, the energy-storage system of the present invention, including the control of solar power system, battery system, battery system are single
Member, energy storage inverter PCS and energy management system EMS.
The solar power system includes that solar power generation module and the MPPT being connected with solar power generation module are chased after
Track device；The battery system includes at least one set of battery modules, and one group of battery modules is connected with a cell system control unit,
Cell system control unit is connected with energy storage inverter PCS, energy management system EMS；The energy storage inverter PCS includes micro- place
Manage device and the first two-way DC/AC converters, solar power generation module passes through MPPT trackers and the first two-way DC/AC converters
DC terminal is connected, and battery system is connected by the first DC/DC converters with the DC terminal of the first two-way DC/AC converters, and first
The exchange end of two-way DC/AC converters is connected with public electric wire net, the exchange end of the first two-way DC/AC converters and public electric wire net it
Between node be connected with user load.
Preferably, as shown in Fig. 2, the battery system is become by the second two-way DC/AC converters and the first two-way DC/AC
The exchange end of parallel operation is connected.
As shown in figure 3, the battery modules include multiple concatenated single batteries and one-to-one with battery modules
Battery management system BMS further includes the temperature sensor being arranged in battery modules, fuse FR1, contactor KM1, current divider
FL1 and radiator fan etc.；The battery management system BMS connect the monomer in acquisition battery modules with multiple single batteries
The monomer battery voltage of battery, battery management system BMS connect acquisition battery modules temperature with temperature sensor.
Specifically, as shown in figure 3, the battery modules include cathode output end DC+ and cathode output end DC-, anode is defeated
Outlet DC+ and cathode output end DC- is used for multiple battery modules in parallel, and battery modules are composed in series by 14 single batteries, often
The specification of a single battery is 3.7V/63Ah；The positive BAT+ of the battery modules by the fuse FR1 that is sequentially connected in series, connect
Tentaculum KM1 is connected with cathode output end DC+, and the cathode BAT- of battery modules passes through current divider FL1 and cathode output end DC- phases
Even；The positive BAT+ of the battery modules is converted by the ship type switch K2 and fuse FR2 being sequentially connected in series and the first DC/DC
The input terminal of device is connected, and the cathode BAT- of battery modules is connected with the input terminal of the first DC/DC converters, the first DC/DC transformation
The output end of device is connected to it with battery management system BMS and provides working power, battery management system BMS and wake-up switch K4 phases
Even, battery management system BMS connect with each single battery, is connect with the temperature sensor being arranged in battery modules, preferably respectively
, the temperature sensor is multiple, is NTC temperature sensors.The model ESBMM- of the battery management system BMS
1613R, main chip model ML5238, STM32F107 execute state parameter acquisition, the failure of energy-storage system of the present invention
The method of type decision and report energy storage inverter PCS, the model SolDate3700TLc of PCS.
It is important to note that as a kind of preferred embodiment, cell system control unit of the invention is directly by each
The battery management system BMS of battery modules is constituted, and multiple battery management system BMS are connected with each other and can carry out slave automatically
Identification constitutes cell system control unit, additional control chip is not necessarily to, in the battery management system BMS of multiple battery modules
One is summarized the state parameter of battery system as host and is communicated with energy storage inverter PCS, remaining as slave simultaneously
State parameter information is provided to host, the cost of energy-storage system can be reduced, be particularly suitable for family's energy-storage system.
When the battery system is provided only with one group of battery modules, then the battery management system that is connected with the battery modules
BMS constitutes cell system control unit, and battery management system BMS is defaulted as host automatically, summarizes the state ginseng of battery system
Number is simultaneously communicated with energy storage inverter PCS；And the battery system is when including multigroup battery modules parallel with one another, then it is multiple
Battery management system BMS carries out host/slave addresses identification automatically, and host is responsible for data summarization and is led to energy storage inverter PCS
News；When there is battery modules to undesirably fall off, if host is detached from, then other slaves then re-start host/slave addresses identification,
Determine that host is communicated with energy storage inverter PCS, if slave is detached from, then host changes slave number automatically, with energy storage inverter
PCS is communicated.
When including below multigroup battery modules for battery system, multiple battery management system BMS carry out master/slave identification
A kind of embodiment：A simulation framework in multiple battery management system BMS is by connecting network to other battery management systems
The BMS that unites sends test signal, and battery management system BMS is more than or fails by connecting network more than or equal to predetermined time-out time
The data that other battery management systems BMS is sent are received, then battery management system is not present in battery management system BMS judgements
BMS hosts, then battery management system BMS regard as host automatically and communicated with energy storage inverter PCS, other battery management systems
System BMS regards as slave automatically.When battery system increases or decreases battery modules, repeat the above process.
The battery management system BMS is connected with each single battery of battery modules connected to it respectively, acquires each list
Body cell voltage, and battery modules voltage is calculated according to monomer battery voltage, battery management system BMS is by the single battery of acquisition
Voltage and monomer battery voltage threshold value comparison judge that single battery is low with the presence or absence of monomer battery voltage, monomer battery voltage is high.
Monomer battery voltage can carry out calculating or by the company with single battery both ends by the sampled signal at single battery both ends
The voltage collection circuit or special chip connect is realized；When monomer battery voltage is less than single battery low voltage threshold, then judgement is deposited
In the low failure of monomer battery voltage；When monomer battery voltage is higher than single battery high voltage threshold, then there are single batteries for judgement
The high failure of voltage；The module monomer voltage value of battery modules can be calculated by each monomer battery voltage in battery modules,
When the difference of minimum cell voltage value in highest monomer battery voltage and battery modules is more than single battery imbalance threshold value, then
There are the unbalanced failures of monomer battery voltage for judgement；The module monomer voltage value can be the flat of each monomer battery voltage
Mean value can also be variance yields or median or calculate otherwise；Battery management system BMS as host
The battery modules voltage for summarizing all battery modules obtains cell system voltage, and the battery management system BMS as host will be counted
Obtained cell system voltage and cell system voltage threshold value comparison judge that battery system whether there is cell system voltage
Failure low, cell system voltage is high.
The battery management system BMS acquires battery modules temperature by temperature sensor, and battery modules temperature can be
The mean value of multiple temperature sensor temperature of acquisition, can also be peak, battery management system BMS by battery modules temperature with
Battery modules temperature threshold compares, and judges whether the failure that battery modules temperature is high, battery modules temperature is low.
The battery modules temperature that battery management system BMS as host summarizes all battery modules obtains battery system temperature
Degree, battery system temperature is compared with battery system temperature threshold, judges that battery system whether there is battery system temperature
Height, battery system temperature are low, battery modules temperature is high, battery modules temperature is low, the big failure of the temperature difference between battery system region.
When battery system temperature is less than battery system temperature Low threshold, then there are the low failures of battery system temperature for judgement；Work as battery system
Then there are the high failures of battery system temperature for judgement when higher than battery system temperature high threshold；When each battery modules temperature and battery system
Then there are the big failure of the battery system temperature difference, battery system temperature can be each for judgement when the difference for temperature of uniting is more than temperature difference threshold
The mean value of battery modules temperature, peak, median or other means calculate.
The battery management system BMS acquires the battery modules charging current of battery modules, battery mould by current divider FL1
Group discharge current, battery modules charging current, battery modules of the battery management system BMS according to each battery modules as host
Discharge current calculates battery system charging, battery system discharge current, by battery system battery system charging current and battery system
System charging current threshold value comparison judges battery system by battery system discharge current compared with battery system discharging current threshold
The failure big with the presence or absence of battery system charging current, battery system discharge current is big, by the charging current of battery modules and electricity
The charging current threshold value comparison of pond module is sentenced by the discharge current of battery modules compared with the discharging current threshold of battery modules
The failure that disconnected battery modules are big with the presence or absence of battery modules charging current, battery modules discharge current is big.
The battery management system BMS, will be exhausted by its R+ insulating monitorings end, R- insulating monitorings end detection insulation internal resistance value
Edge internal resistance value and insulation values threshold value comparison judge battery modules with the presence or absence of the low failure of insulation values, it is preferred that insulation values threshold value
It is set to 500M Ω.When arbitrary battery modules are low there are faulty insulator value, the battery management system BMS as host report to
Energy storage inverter PCS, and there are the serial numbers of the battery modules of the low failure of insulation values for report.
The battery management system BMS detects the ends DC+ by its relay status, relay status detects the ends DC-, inspection
Whether consistent contactor KM1 both end voltages are surveyed, to judge the problem of battery modules whether there is relay adhesion.When arbitrary electricity
Pond module gives energy storage inverter PCS there are when relay adhesion, the battery management system BMS as host is reported, and reports and deposit
In the serial number of the battery modules of relay adhesion fault.
Further, the battery management system BMS also has temperature compensation function, for being put to single battery under low temperature
Electricity compensates, and radiates to battery modules under high temperature.Preferably, battery management system BMS passes through control interface and temperature control
Device is connected, and temperature control device includes radiator fan and heating mechanism, when the temperature of battery modules is more than its high temperature threshold value, heat dissipation
Starting fan is conducive to the rapid cooling of battery modules, and when the temperature of battery modules is less than its low temperature threshold, heating mechanism opens
Dynamic, to improve the temperature of battery modules, radiator fan and heating mechanism are used cooperatively, and battery modules is made to be maintained at best effort temperature
It spends in section and works, advantageously ensure that battery modules uses capacity, extends the service life of battery modules.As shown in figure 3, electric
Pond management system BMS is connected with radiator fan controls startup/stopping of radiator fan；When battery modules temperature >=28 DEG C, electricity
Pond manages system BMS control radiator fans and starts, when battery modules temperature≤25 DEG C, battery management system BMS control heat dissipations
Fan stops.It should be pointed out that the radiator fan of the temperature control device is the mark of the distributed home energy-storage system of the present invention
Quasi- configuration；And heating mechanism is then configured according to the use environment property of can be chosen of user, such as the southern area in China, it is whole
Body environment temperature is higher, then need not configure heating mechanism, and in the northern area of China, since winter temperature is too low, then need
Configure heating mechanism.
Further, the battery management system BMS also has balance control function, is used for balanced monomer battery voltage,
Specific method is：When detecting that highest monomer battery voltage is higher than certain value, and there are pressure differences between each single battery, then pass through
The form that electric current overpower internal resistance is consumed carries out single battery balanced.
As another embodiment of cell system control unit, cell system control unit is then by the electricity of each battery modules
Pond manages system BMS and an additional control chip is constituted, and control chip is connect with each battery management system BMS, summarizes electricity
The state parameter of cell system is simultaneously communicated with energy storage inverter PCS.
State parameter described in the battery management system BMS of the energy-storage system of the present invention includes cell system voltage, battery
System charging current, battery system discharge current, monomer battery voltage, the remaining capacity SOC of battery system, battery system temperature
Degree, battery modules temperature, the insulation values of battery system and relay end voltage etc..The fault type includes cell system voltage
Height, monomer battery voltage are high, cell system voltage is low, monomer battery voltage is low, monomer battery voltage is unbalanced, battery system temperature
Degree is high, battery system temperature is low, the battery system temperature difference is big, battery system charging current is big, battery system discharge current is big, insulation
It is worth low and relay adhesion etc., a kind of fault type is related to a kind of state parameter.
Further, multiple alarm levels are arranged for same fault type in battery management system BMS, can be directed to same shape
The multiple and different grade threshold of state parameter setting carries out classifying alarm for different grade thresholds, takes different measures.Institute
Battery management system BMS is stated to calculate maximum chargeable/discharge current of battery system in real time, judge the fault type of energy-storage system
And alarm level, and it is reported to energy storage inverter PCS, energy storage inverter PCS can be according to maximum chargeable/electric discharge of battery system
Electric current, fault type and alarm level control the charge/discharge of battery system.
When the energy-storage system normal operation of the present invention, battery management system BMS acquires the single battery of battery modules in real time
Voltage, and calculate in real time according to monomer battery voltage the chargeable electric current of maximum of battery modules, maximum can discharge current, as master
The battery management system BMS of machine calculate the maximum chargeable electric current of battery system, battery system maximum can discharge current, and be reported to
Energy storage inverter PCS, the actual charge current of energy storage inverter PCS control battery systems, actual discharge electric current are no more than battery
The maximum chargeable electric current of the battery system for the battery system that system control unit reports, battery system maximum can discharge currents.Tool
Body is as follows：
The battery modules are composed in series by 14 single batteries, and the specification of single battery is 3.7V/63Ah.
(10) the highest monomer battery voltage ＜ 4.1V of battery management system BMS acquisition, then battery management system
The chargeable electric current of maximum that BMS is reported to energy storage inverter is N*72A, and N is the group number of battery modules；
(11) the highest monomer battery voltage of the battery management system BMS acquisitions, meets 4.1V≤highest monomer
Cell voltage≤4.12V, then the chargeable electric current of maximum that battery management system BMS is reported to energy storage inverter PCS is N*38A,
N is the group number of battery modules；
(12) the highest monomer battery voltage ＞ 4.12V of the battery management system BMS acquisitions, battery management system
BMS reports energy storage inverter PCS to stop charging, if highest monomer battery voltage is fallen after rise to 4.12V hereinafter, battery management system
BMS still reports energy storage inverter PCS to stop charging, until battery management system BMS detects battery system electric discharge and discharges
When capacity is more than 5% battery system capacity, battery management system BMS is determined according to highest monomer battery voltage at this time again
Maximum chargeable electric current is simultaneously reported to energy storage inverter PCS；
(20) minimum monomer battery voltage the ＞ 3.5V, battery management system BMS of the battery management system BMS acquisitions
Be reported to energy storage inverter PCS maximum can discharge current be N*72, N be battery modules group number；
(21) the minimum monomer battery voltage of battery management system BMS acquisition meets 3.4≤minimum monomer
Cell voltage≤3.5V, battery management system BMS be reported to energy storage inverter PCS maximum can discharge current be N*38A, N is
The group number of battery modules；
(22) minimum monomer battery voltage the ＜ 3.4V, battery management system BMS of the battery management system BMS acquisitions
Energy storage inverter PCS is reported to stop electric discharge, if minimum monomer battery voltage gos up to 3.4V or more, battery management system BMS
Energy storage inverter PCS is still reported to stop electric discharge, until battery management system detects that system charges, and charging capacity is more than
When 5% battery system capacity, battery management system BMS determines that maximum can be put according to monomer battery voltage minimum at this time again
Electric current is simultaneously reported to energy storage inverter PCS.
If the energy-storage system of the present invention is alarmed, rule corresponding with type of alarm, grade, progress charge and discharge are followed
Electricity, specific rules have a detailed description below.
Table one and table two show, the alarm etc. of the various fault types, each fault type of energy-storage system of the invention
Grade from the activation threshold value of the alarm level, under the different alarm level states of different faults type energy storage inverter PCS to electricity
The control of the charge/discharge of cell system, and energy storage inverter PCS connects under the different alarm level states of different faults type
Receive the message action after cell system control unit message；
Wherein, cell system voltage is high, monomer battery voltage is high, cell system voltage is low, monomer battery voltage is low, battery
System temperature is high, the battery system temperature difference is big low with insulation values, and the above fault type is divided into three kinds of grades because of the difference of activation threshold value
Alarm, respectively level-one alarm, secondary alarm and three-level alarm；Wherein, monomer battery voltage is unbalanced, above-mentioned fault type
Because of the difference of activation threshold value, it is divided into the alarm of two kinds of grades, respectively secondary alarm and three-level alarm；Wherein, charging current it is big,
Discharge current is big, relay adhesion, and above-mentioned fault type is three-level alarm；Wherein battery system temperature is low, and above-mentioned failure is because touching
The difference for sending out threshold value is divided into level-one alarm and secondary alarm.The energy-storage system of the present invention, when sending out level-one alarm, PCS allows electricity
Cell system charge/discharge and can voluntarily it restore under malfunction；When sending out secondary alarm, fault type is battery system electricity
Pressure is high, monomer battery voltage is high, battery system temperature is high, then energy storage inverter PCS forbids battery system to charge/allow battery system
System electric discharge, fault type are that cell system voltage is low, monomer battery voltage is low, then energy storage inverter allow battery system charge/
Battery system is forbidden to discharge, fault type is that monomer battery voltage is unbalanced, the battery system temperature difference is big, insulation values are low, then energy storage
It is that battery system temperature is low that inverter PCS, which forbids battery system charge/discharge, fault type, then energy storage inverter PCS allows electricity
Cell system charge/discharge；Send out three-level alarm when, PCS forbid battery system charge/discharge and cannot nonserviceable under voluntarily
Restore.Specifically it see the table below：
Table one (environment temperature >=10 DEG C)：
Table two (environment temperature ＜ 10 DEG C when)：
Note：In above table, (1) " power (0.3C) drops in PCS " refers to energy storage inverter PCS with energy-storage system
The current value that rated capacity * 0.3 is obtained carries out charge and discharge to battery system；(2) " block system relay " refers to cut-out contactor
KM1；(3) battery system temperature is according to acquisition with battery modules temperature；(4) " PCS force disconnects " refers to and battery system
The circuit of connected energy storage inverter PCS cut-out thereins, to disconnect；(5) " relay adhesion " refers to contactor
KM1 adhesions.
The cell system control unit that the battery management system BMS is constituted enters in following three to be conducive to drop
The dormant state of low-power consumption is respectively：
A. the cell system control unit and energy storage inverter PCS communication interruption times >=5min, battery management system
The cell system control unit that BMS is constituted enters dormant state；
B. minimum monomer battery voltage ＜ 3.4V or minimum battery modules voltage ＜ 47.6V, and it is electric in 24 hours
Cell system control unit detects energy storage inverter PCS and does not charge to battery system, then cell system control unit enters suspend mode shape
State；
C. there is three-level alarm, and duration >=5min of three-level alarm, then cell system control unit enters suspend mode
State.
When the cell system control unit enters dormant state, control contactor KM1 is disconnected, and power ＜ 0.1W.
After the cell system control unit enters dormant state, it can wake up in the following manner：
A1. the cell system control unit in the dormant state, is then attempted to read and parses energy storage inverter per 15s
The message of PCS, if reading the heartbeat instruction of energy storage inverter PCS, cell system control unit is waken up；
B1. because of duration >=5min of three-level alarm and three-level alarm, cell system control unit is made to enter suspend mode
State then can only wake up cell system control unit by ship type switch K2.
The power up of the cell system control unit is as follows：
One：The battery system includes 1 group of battery modules, which is connected with a battery management system BMS；System
When system powers on, manual closing ship type switch K2, battery management system BMS detect battery state, and monomer organizes end, the shapes such as temperature
State, then control contactor KM1 is closed fault-free.
Two：The battery system includes multiple battery modules parallel with one another, a battery modules and a battery management
System BMS is connected, and multiple battery management system BMS are connected by communication connector；When system electrification, power on delay 10s is multiple
Battery management system BMS carries out host/slave addresses identification automatically, and each battery management system BMS detects corresponding battery mould respectively
The state of group is simultaneously sent to battery management system BMS as host, if the battery management system BMS judgement electricity as host
Voltage difference between the module of pond, which is less than, powers on threshold pressure differential 3V, and the alarm of fault-free type, then passes through each battery management system
The contactor KM1 for BMS control battery modules of uniting is closed,
If pressure difference between battery modules, which is more than, powers on threshold pressure differential 3V, the minimum battery modules of first sealing voltage and with most
Low-voltage pressure difference is less than the contactor KM1 for the battery modules for powering on threshold pressure differential 3V, charging is opened, until the pressure between battery modules
Difference, which is less than, powers on the high contactor KM1 for reclosing remaining battery modules of voltage after threshold pressure differential 3V.
The lower machine process of the cell system control unit is as follows：
If the minimum monomer battery voltage ＜ 3.4V of the cell system control unit acquisition, and energy storage inverter
PCS in 24 hours not to battery system charging (battery management system BMS is determined as PCS input terminals without input at this time, i.e., without
Alternating current or photovoltaic state), then battery management system BMS automatically into dormant state and disconnects contactor KM1；If the battery
The minimum monomer battery voltage ＜ 3.4V of system control unit acquisition, energy storage inverter filled battery system in 24 hours
Electricity, then battery management system BMS be kept in contact device KM1 and be closed, energy-storage system enters normal charging condition.
Preferably, the battery management system by CAN communication mode or RS485 communication modes and energy storage inverter PCS,
Energy management system EMS is connected, and is communicated.
Further, the energy-storage system further includes indicator lamp groups, is used to indicate the state of battery system and electromagnetism module, electricity
The battery management system BMS of pond module is connect with indicator lamp groups respectively.The work shape of battery management system BMS control indicator lamp groups
State, including light rule, indicator lamp groups light color etc., so that user is passed through the fortune that indicator lamp groups intuitively check battery system 1
Row state is conducive to user and pinpoints the problems and handle in time
As shown in Figure 3, Figure 4, the indicator light module include the indicator light battery plate being connected with BMS and with indicator light battery plate
Connected multiple indicator lights.The indicator light battery plate includes signal input part and power input, and signal input part includes CAN1H
Signal input part and several signal input parts of CAN, power input include 12 or 24V electrode input ends and GND ground terminals, instruction
Lamp battery plate is connected by signal input part and power input pin corresponding on battery management system BMS.c
As shown in figure 4, the BMS can control indicator lamp groups according to the operating status of battery system 1, control process is as follows：
The indicator lamp groups include 20 indicator lights from left to right arranged in a straight line, and 20 indicator lights are respectively from left to right No. 1-20.
Rule is lighted in state one, (1)：After user is closed ship type switch K2, BMS power-on self-tests control the 20 of indicator lamp groups
A indicator light shines, and flickers 15 seconds, is divided between scintillation time 1 second；(2) light color：Green；
Rule is lighted in state two, (21)：The PCS controls battery system 1 charges normal, and BMS makes N number of finger of indicator lamp groups
Show that lamp is lighted one by one, is divided between lighting time 0.5 second, the number N for the indicator light lighted and the real-time remaining electricity of battery system 1
It measures SOC to correspond to, after N number of indicator light is all lighted, is kept for 1 second, then extinguished, repeat aforementioned process；(22) light color：It is green
Color；(23) example：As shown in Fig. 2, the PCS controls battery system 1 charges normal, BMS controls 16 indicator lights and lights, then 1-
No. 16 are from left to right lighted successively, are divided between lighting time 0.5 second, after No. 16 indicator lights are lighted, 16 indicator light holding points
Bright 1 second, all extinguish, keeps extinguishing 1 second, repeat aforementioned process.
Rule is lighted in state three, (31)：The PCS controls 1 regular picture of battery system, when beginning, BMS control instructions
N number of indicator light of lamp group is all lighted, the number N for the indicator light lighted and the real-time remaining capacity SOC pair of battery system 1
It answers, then extinguishes one by one, be divided between the fall time 0.5 second, after N number of indicator light all extinguishes, kept for 1 second, repeated aforementioned
Process；(32) light color：Green；(33) example：As shown in Fig. 2, the PCS controls 1 regular picture of battery system, 1-16
Number 16 indicator lights all lighted, then with 0.5 second extinguishing interval time, from No. 16 indicator lights to No. 1 indicator light according to
Secondary extinguishing after all extinguishing, keeps extinguishing 1 second, repeats aforementioned process.
Rule is lighted in state four, (41)：Under dormant state or power save mode, the indicator light of the BMS controls indicator lamp groups
All extinguish.
State five
Under alarm condition, the BMS can show the display lamp of lamp group according to the different controls of fault type and alert levels
Working condition, shown in table specific as follows：
When environment temperature≤10 DEG C, the working condition of the indicator lamp groups of state five makes amendment, table specific as follows：
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's
Protection domain.
Claims (10)
1. a kind of energy-storage system, it is characterised in that：It includes battery system, the battery system being connect with battery system control list
Member and energy storage inverter PCS；The battery system includes at least one set of battery modules, and battery modules include multiple concatenated
Single battery and with the one-to-one battery management system BMS of battery modules；Cell system control unit and energy storage inverter PCS
It is connected；
The state parameter of the cell system control unit acquisition battery system, the failure according to state parameter judgement battery system
Fault type simultaneously reported and gives energy storage inverter PCS by type, and energy storage inverter PCS is filled according to fault type control battery system
Electricity/electric discharge.
2. energy-storage system according to claim 1, it is characterised in that：The battery system includes multiple battery modules and divides
Multiple battery management system BMS, multiple battery management system BMS are not connected with each other and can correspondingly with multiple battery modules
Cell system control unit is constituted to carry out slave identification automatically, one in the battery management system BMS of multiple battery modules
It is a to summarize the state parameter of battery system as host and communicated with energy storage inverter PCS, remaining as slave and to
Host provides state parameter information.
3. energy-storage system according to claim 1, it is characterised in that：The battery system include a battery modules and with
The battery modules corresponding battery management system BMS, described battery management system BMS constitute battery system control
Unit, battery management system BMS summarize the state parameter of battery system as host and are led to energy storage inverter PCS
News.
4. energy-storage system according to claim 2, it is characterised in that：The battery management system BMS passes through temperature sensing
Device acquires the battery modules temperature of each battery modules, multiple battery moulds of the battery management system BMS as host according to acquisition
The battery modules temperature of group judges energy-storage system with the presence or absence of the big failure of the battery system temperature difference.
5. energy-storage system according to claim 1, it is characterised in that：The battery management system BMS connects respectively and with it
Each single battery of the battery modules connect connects, and acquires each monomer battery voltage and calculates battery modules according to monomer battery voltage
Voltage and module monomer voltage value, it is electric with the presence or absence of monomer by monomer battery voltage and comparing to determine for module monomer voltage value
The unbalanced failure of cell voltage.
6. energy-storage system according to claim 2 or 3, it is characterised in that：
The battery management system BMS is connected with each single battery of battery modules connected to it respectively, acquires each monomer electricity
Cell voltage, and battery modules voltage is calculated according to monomer battery voltage, battery management system BMS is by the monomer battery voltage of acquisition
With monomer battery voltage threshold value comparison, judge single battery with the presence or absence of the event that monomer battery voltage is low, monomer battery voltage is high
Barrier；The battery modules voltage that battery management system BMS as host summarizes all battery modules obtains cell system voltage, makees
For host battery management system BMS by the cell system voltage being calculated and cell system voltage threshold value comparison, judge electricity
Cell system is with the presence or absence of the failure that cell system voltage is low, cell system voltage is high；
And/or the battery management system BMS acquires the battery modules charging current of battery modules, battery by current divider FL1
Module discharge current, battery modules charging current according to each battery modules of battery management system BMS as host, battery mould
Group discharge current calculates battery system charging, battery system discharge current, by battery system battery system charging current and battery
System charging current threshold value comparison judges battery system by battery system discharge current compared with battery system discharging current threshold
The failure that system is big with the presence or absence of battery system charging current, battery system discharge current is big；
And/or the battery management system BMS acquires battery modules temperature by temperature sensor, judges whether battery
The failure that module temperature is high, battery modules temperature is low, the electricity of all battery modules is summarized as the battery management system BMS of host
Pond module temperature obtains battery system temperature, judges that battery system is high with the presence or absence of battery system temperature, battery system temperature is low
Failure.
7. energy-storage system according to claim 1, it is characterised in that：
The battery management system BMS detects the insulation internal resistance of energy-storage system by its R+ insulating monitorings end, R- insulating monitorings end
Value, and according to the insulation internal resistance value of acquisition, judge energy-storage system with the presence or absence of the low failure of insulation values；
And/or the battery management system BMS detections battery modules whether there is the failure of relay adhesion.
8. energy-storage system according to claim 1, it is characterised in that：
Multiple alarm levels are arranged for same fault type in the cell system control unit, are arranged for same state parameter
Multiple and different grade thresholds carries out classifying alarm for different grade thresholds.
9. energy-storage system according to claim 1, it is characterised in that：
The maximum chargeable electric current of battery system, the battery system that the cell system control unit calculates battery system in real time are maximum
Can discharge current, and be reported to energy storage inverter PCS, actual charge current, the reality of energy storage inverter PCS control battery systems
Discharge current is no more than the maximum chargeable electric current of battery system, the battery system for the battery system that cell system control unit reports
Maximum can discharge current.
10. energy-storage system according to claim 9, it is characterised in that：
The highest monomer battery voltage ＜ a of battery management system BMS acquisition, then cell system control unit be reported to storage
The chargeable electric current of maximum of energy inverter PCS is N*72A, and N is the group number of battery modules；
The highest monomer battery voltage of the battery management system BMS acquisitions, meets a≤highest monomer battery voltage≤b,
The chargeable electric current of maximum that then cell system control unit is reported to energy storage inverter PCS is N*38A, and N is the group of battery modules
Number, a and b are preset rotection thresholds, a ＜ b；
The highest monomer battery voltage ＞ b of battery management system BMS acquisition, then cell system control unit report energy storage
Inverter PCS stops charging, if highest monomer battery voltage is fallen after rise to b hereinafter, cell system control unit still reports storage
Energy inverter PCS stops charging, until cell system control unit detects battery system electric discharge and the electricity of discharge capacity ＞ 5%
When cell system capacity, cell system control unit determines maximum chargeable electricity according to the highest monomer battery voltage of acquisition again
It flows and is reported to energy storage inverter PCS.
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